6E7.5 Sunlight and Earth's Energy

Why is sunlight crucial for life on Earth?

• It produces carbon dioxide.

• It creates water.

• It keeps the Earth warm.

• It provides oxygen.

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What process in the sun generates energy?

• Evaporation

• Fusion

• Combustion

• Fission

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How long does it take for sunlight to reach Earth?

• About 8 minutes

• About 8 days

• About 8 hours

• About 8 seconds

What is the estimated amount of hydrogen fused into helium every second in the sun?

• 4 million tons

• 1 million tons

• 600 million tons

• 596 million tons

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What is the speed at which energy travels from the sun to Earth?

• 186 million miles per hour

• 186 million miles per second

• 186 thousand miles per second

• 186 thousand miles per hour

What happens to the more dangerous forms of sunlight when they reach Earth?

• They are absorbed by the oceans.

• They are filtered and absorbed by the upper atmosphere.

• They are reflected back to the sun.

• They pass through the atmosphere unchanged.

Why does it get cooler the higher you go in the atmosphere?

• Because of the wind.

• Because there is less sunlight.

• Because the Earth’s atmosphere is mostly heated from the Earth’s surface.

• Because the air is thinner.

What are greenhouse gases responsible for?

• Creating sunlight

• Producing oxygen

• Absorbing and re-emitting energy

• Reflecting all sunlight back to space

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What is the natural greenhouse effect?

• The cooling of the Earth by the upper atmosphere.

• The process of plants growing in greenhouses.

• The trapping of heat in the lower atmosphere by greenhouse gases.

• The reflection of sunlight by the Earth's surface.

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What would happen if the energy from the sun did not escape back into space?

• The Earth would become too cold.

• The Earth would have no atmosphere.

• The Earth would become too hot for life.

• The Earth would remain the same temperature.